| 1999 | |
|---|---|
| Garissa | 28.4 |
| Mombasa | 22.8 |
| Nairobi | 18.5 |
| Turkana | 16.2 |
| Wajir | 15.7 |
| Lamu | 15.6 |
| Kisumu | 15.4 |
| Samburu | 14.7 |
| Uasin Gishu | 14.5 |
| Machakos | 13.9 |
| Mandera | 13.1 |
| Isiolo | 13.0 |
| Kiambu | 12.9 |
| Kwale | 12.9 |
| Kilifi | 12.6 |
| Tana River | 12.6 |
| Kajiado | 12.2 |
| Makueni | 11.6 |
| Vihiga | 11.1 |
| Marsabit | 10.3 |
| Nakuru | 10.0 |
| Trans Nzoia | 10.0 |
| Taita Taveta | 9.4 |
| Nandi | 8.8 |
| West Pokot | 8.4 |
| Migori | 8.3 |
| Narok | 8.2 |
| Baringo | 8.1 |
| Laikipia | 8.1 |
| Kakamega | 7.7 |
| Homa Bay | 7.1 |
| Kericho | 6.2 |
| Busia | 6.0 |
| Embu | 5.7 |
| Bungoma | 5.6 |
| Siaya | 5.5 |
| Nyeri | 5.3 |
| Bomet | 4.9 |
| Kitui | 4.7 |
| Muranga | 4.2 |
| Kirinyaga | 3.8 |
| Nyandarua | 2.9 |